So when Moody's says a collateralized debt obligation, a corporate bond and a sovereign issue are all rated AA, the implication is that the three types of bonds are equally healthy.

也就是说，当穆迪将一种债务担保证券、一种公司债券和一种主权债券均评为AA级，那就意味着穆迪认为这三种债券的信用程度是相同的。

youdao

In valence bond theory, the focus is on discussing the bonds, but it should look very familiar to you, because there's two types of bonds that we want to discuss here.

在价电子成键理论中，所关注的是讨论成键，但这对于你们来说应该很熟悉，因为这是我们要讨论的两种键。

youdao

Since the survival of an overlay is the bond, concrete must be clean and the overlay properly applied if these types of creations are expected to last.

由于一个覆盖生存是债券，具体要廉洁和应用得当，如果这些类型的作品，预计最后的覆盖。

youdao

So in terms of thinking about ethane, we actually have two bond types that we're going to be describing just in terms of the carbon-carbon bond and then the carbon h bonds.

对于乙烷，我们有两种键,我们继续讨论一下,碳碳键,和碳氢键。

麻省理工公开课 - 化学原理课程节选